Armed with gloves, a backpack, and a healthy appreciation for the deadliness of the third rail, urban historian Steven Duncan and videographer Andrew Wonder explore the Undercity. This is the hidden New York. And it's beautiful.

Wonder shot the compilation of urban explorations—appropriately titled Undercity—on a Canon 5d Mark II. The journeys range from sewer to subway to Williamsburg Bridge, and give a look at the world that's happening underneath our feet, unbeknown to us, every single day. Duncan's made a mission out of these journeys, collecting his photographs and videos at Undercity.org.

What's exciting is that every city has its own secret history, sealed underground, untapped and waiting to be explored. Let's hope Wonder and Duncan decide to take their show on (and below) the road. [NPR via io9]